A fault tolerant computer system is described in which a direct memory access controller examines the check bit data on every data element that is accessed by the system. The address of any data element that is found to have an error in the check bit data is stored by the direct memory access controller,...http://www.google.de/patents/US5588112?utm_source=gb-gplus-sharePatent US5588112 - DMA controller for memory scrubbing
